Solutions for a better world

Narragansett Bay Combined Sewer Overflow Abatement Program | Providence, RI, US

  • group of workers inside tunnel
  • wastewater tunnel
  • train in tunnel with muck cars
  • unloading equipment into tunnel
  • man next to wastewater pump equipment
  • wastewater equipment inside tunnel
  • equipment inside tunnel
  • shaft looking up through stairway and steel roof deck
  • wastewater equipment inside cavern
Wastewater treatment keeps Narragansett Bay clean

Located in Rhode Island Sound, off the Atlantic Ocean, Narragansett Bay is an estuary that receives fresh water from nearby rivers and streams. It is home to hundreds of species of fish.

Challenge
The Narragansett Bay Commission, created in 1982 and based in Providence, R.I., is charged with keeping the bay clean while providing safe and reliable wastewater treatment. The commission needed a comprehensive treatment program for the waters surrounding Providence, Pawtucket and Central Falls due to pollution problems with the overflows from the existing combined sewer system.

Solution
More than 20 years ago, the Narragansett Bay Commission retained Louis Berger to develop its first combined sewer overflow abatement plan. Since then, experts at Louis Berger have continued to serve as an extension of the commission staff in managing all aspects of the abatement program, from completing environmental studies and securing regulatory permits to managing design and construction of special projects, such as a deep storage tunnel, a pump station, sewer separations, interceptors and a wetlands treatment facility.

Louis Berger has helped the commission improve water quality in the bay to comply with the Federal Clean Water Act and make the bay safe for the wildlife and local economies that rely on its ecosystem and for community recreational use.

Services provided by Louis Berger include:

  • Providing overall program management and project controls functions.
  • Serving as lead design manager, coordinating with state agencies and overseeing the subcontracting and performance of design engineers.
  • Managing design and construction of wastewater infrastructure projects, including a three-mile-long, 26-foot-wide tunnel, located 270 feet underground and tied into a pump station that moves 50 million gallons of wastewater daily.